Electron gun and hydraulic press: what they have in common

1. Step 1. Electron gun — is part of — Electron microscope. A source of electrons.
2. Step 2. Electron microscope — has part — Vacuum pump. A vacuum in the column.
3. Step 3. Vacuum pump — evolved from — Piston pump. Guericke adapted the piston pump to pump out air.
4. Step 4. Piston pump — is part of — Concrete pump. A piston pump.
5. Step 5. Concrete pump — has part — Hydraulic cylinder. Hydraulics.
6. Step 6. Hydraulic cylinder — is part of — Hydraulic press. Two cylinders of different diameters.

Open Evothings